No not really at all, the small torch did a good job concentrating the heat into the center back of the bolt. Was very careful and tried to be patient.And you didn’t damage the paint with the extra heat you were applying in that one concentrated spot?
One was really stuck on there, I had reheated, then used the bolt extractor that locked up my drill in all the settings up until 'hammer drill'. When I switched to that torque setting the extractor broke and the bolt didn't budge.
I did buy the cheapest Amazon food torch for this job and it's a piece of junk, the main valve locked itself open but the control valve did a good job regulating the fuel